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my $fn_count = $ARGV[0] - ($ARGV[0] - 1);

#  doesn't that just always set $fn_count = 1 ?
#  (is it a goal of this class project to write obfuscated code?)

$remainder = ( 12 % 5 );  # i.e. 2
$remainder = ( 14 % 7 );  # i.e. 0
# etc...